Cs<sub>2</sub>CO<sub>3</sub>-Promoted Direct<i>N</i>-Alkylation: Highly Chemoselective Synthesis of<i>N</i>-Alkylated Benzylamines and Anilines
作者:Juan-Carlos Castillo、Jessica Orrego-Hernández、Jaime Portilla
DOI:10.1002/ejoc.201600549
日期:2016.8
Herein is described an efficient and chemoselective method for the synthesis of diversely substituted secondary amines in yields up to 98 %. Direct mono-N-alkylation of primary benzylamines and anilines with a wide range of alkyl halides is promoted by a cesium base in the absence of any additive or catalyst. The basicity and solubility of cesium carbonate in anhydrous N,N-dimethylformamide not only
本文描述了一种以高达 98% 的产率合成多种取代的仲胺的有效和化学选择性方法。在没有任何添加剂或催化剂的情况下,铯碱促进了伯苄胺和苯胺与各种烷基卤的直接单-N-烷基化。碳酸铯在无水 N,N-二甲基甲酰胺中的碱性和溶解性不仅能够实现伯胺的单-N-烷基化,而且还能抑制所需胺的不希望的二烷基化。